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For 540i's and 740is sure, but for an E36 i'm pretty sure you need to expand the stock intake boot or get a new one. You would also need updated engine software for it to work properly.

do i have to expand the boot both before and after the maf.... and will ti run fine with the e36.... im planing to get a software done by november...would it do anything bad to my engine till november...

do i have to expand the boot both before and after the maf.... and will ti run fine with the e36.... im planing to get a software done by november...would it do anything bad to my engine till november...

I thought I heard someone mentioning software so here I am!

Yes just keep that bigger MAF stored away till you come to me for software.
A bigger MAF is not really required unless you use bigger cams and get the airflow up, a stock one will work fine otherwise.